The ship, originally called the Star, was built in 2007 in Finland for Tallink Grupp and has been renamed as the Oscar Wilde.
The vessel will be the largest and fastest passenger cruise ferry on the Irish Sea with a capacity of more than 2,080 passengers, 134 cabins and more than 2,380 lane meters for cars, coaches and freight vehicles.
The ship’s interior features freight driver facilities, Club Class lounge, a self-service restaurant, an a la carte restaurant, a bar, gaming facilities, pet facilities and a children’s play area.
Irish Ferries managing director, Andrew Sheen, said: "This new ship will be a fantastic addition to our service, offering customers the very best in terms of comfort, speed, and amenities.
"Along with usual advantages of ferry travel in terms of no luggage restrictions or security queues, we are confident that the Oscar Wilde will become a firm favourite with our passengers and freight drivers, and we look forward to welcoming them on board."